EP0890110B1 - Procede pour le controle des connexions de masse de pieces d'un systeme formant un reseau - Google Patents

Procede pour le controle des connexions de masse de pieces d'un systeme formant un reseau Download PDF

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Publication number
EP0890110B1
EP0890110B1 EP97916391A EP97916391A EP0890110B1 EP 0890110 B1 EP0890110 B1 EP 0890110B1 EP 97916391 A EP97916391 A EP 97916391A EP 97916391 A EP97916391 A EP 97916391A EP 0890110 B1 EP0890110 B1 EP 0890110B1
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EP
European Patent Office
Prior art keywords
sgn
potential
subscriber
voltage
line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97916391A
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German (de)
English (en)
Other versions
EP0890110A1 (fr
Inventor
Jürgen MINUTH
Jürgen Setzer
Günther Schwarz
Max Reeb
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Daimler AG
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DaimlerChrysler AG
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Filing date
Publication date
Priority claimed from DE19611944A external-priority patent/DE19611944C2/de
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP0890110A1 publication Critical patent/EP0890110A1/fr
Application granted granted Critical
Publication of EP0890110B1 publication Critical patent/EP0890110B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/50—Testing arrangements

Definitions

  • the present invention relates to a method for checking the ground contact of participants in a networked system according to claims 1, 2 and 7 and a device for checking the ground contact of participants in a networked system according to claim 16.
  • Data is written and read into the protocol of this data bus by applying a certain voltage level to the line or lines for a certain period of time. For this it is necessary that these control units have an almost identical reference potential. In the case of a motor vehicle, this is the vehicle mass with which all electrical devices in a motor vehicle are contacted as an equipotential surface.
  • Networked systems of the type described are e.g. known as CAN systems.
  • a circuit arrangement is known from EP 0 614 298 A2, by means of which a total failure of the entire network is to be avoided if one of the participants in the networked system breaks the ground connection or there is a short circuit to the supply potential.
  • EP 0 474 907 A1 discloses a method for error detection in a networked system, in which the participants in the networked system are connected to one another in a ring.
  • a wire break at a point in the networked system can be recognized in this method by the data starting from a subscriber be sent in both directions. If a receiver receives the data from only one direction, it can be concluded that there is a wire break between the two participants on the path corresponding to the other direction.
  • this object is achieved according to the invention by comparing the voltage across the resistor arrangement with a predetermined potential for checking the ground contact of participants in the networked system if the line has a potential in a steady state, with a comparison of the voltage across the Resistor arrangement with the predetermined potential on the state of ground contact of the participant is concluded.
  • the object according to claim 1 describes the possibility of determining a test of the ground contact by means of the CAN_H line.
  • a further solution according to the invention is described in claim 2, according to which, in a networked system in which data is sent and received via at least one line, at least one line on each subscriber being connected to a subscriber-specific potential of the subscriber via a resistor arrangement and via controllable switch and a contact with a common potential, an inventive method is realized by the voltage across the resistor arrangement with a predetermined potential a comparison is made if the line has a potential in a steady state, the state of the ground contact of the subscriber being concluded from a comparison of the voltage across the resistor arrangement with the predetermined potential.
  • the object according to claim 2 describes the possibility of determining a test of the ground contact using the CAN_L line.
  • the potential in the steady state is the common potential.
  • the potential in the steady state corresponds to the participant-specific potential.
  • the comparison is made with a certain time lag after the line is switched to a certain potential by means of the controllable switches.
  • the time lag must on the one hand be dimensioned such that the steady state is reached and on the other hand must be dimensioned such that the potential has not already been switched back.
  • the comparison takes place within a time window after the switching state of the controllable switch has changed.
  • the time delay that the components have until the switching process actually takes place is advantageously exploited.
  • the state of the transceiver changes, it takes around 500ns until the switching process has taken place.
  • the comparison takes place within this time window. This advantageously ensures that the potential is in a steady state. It also ensures that the right potential is available.
  • the battery voltage ascertainable by the individual subscriber is compared with the battery voltage ascertainable by one or more reference subscribers, with faulty ground contact being concluded in the event of a deviation in the battery voltages ascertained above a certain threshold value.
  • This method is suitable for determining a possibly faulty ground contact regardless of the check described so far.
  • the locally ascertained battery voltage is sent, for example, as information via the bus to a further control device which itself determines the battery voltage ascertainable there as a reference. If the transmitted value of the battery voltage is lower or higher, a ground fault can be concluded.
  • the locally ascertained battery voltage is sent, for example, as information via the bus to a further control device which itself determines the battery voltage which can be ascertained there as a reference. If the transmitted value of the battery voltage is lower or higher, a ground fault can be concluded.
  • the contacting of the reference subscriber is carried out twice to improve the contacting.
  • the comparison of the battery voltage in a motor vehicle takes place only above a certain speed value.
  • the comparison is activated when a certain minimum load current flows in the corresponding subscriber.
  • an entry is made in a diagnostic memory in the event of a detected deviation above the threshold value relating to the respective subscriber.
  • the one-wire reception thresholds are correspondingly shifted when a deviation is detected above the threshold value for the respective subscriber.
  • the mass offset detection is queried multiple times.
  • mass shifts caused by dynamic events can be caused by e.g. the blocking current of a variable motor are filtered.
  • Claim 16 describes an embodiment of a device according to the invention for testing the ground contacting of participants in a networked system, the networking being realized by sending and receiving data over two lines, one line on each participant via a resistor arrangement and contacting with a common potential the subscriber is connected and can be connected to a further potential via a controllable switch, the other line on each subscriber being connected to a subscriber-specific potential of the subscriber via a resistor arrangement and being connectable to a common potential via a controllable switch and contacting, where the voltage dropping across at least one resistor arrangement is fed to one input of a comparator, the other input of which is supplied with a comparison potential, the output signal of the comparator pointing to d The state of ground contact of the participant is closed.
  • the different potentials which are fed to the inputs of the comparators are generated from a voltage via a multiplexer and are fed to the respective inputs of the comparators.
  • FIG. 1 shows the representation of several networked participants.
  • the participants are formed by control devices that have a microcontroller.
  • Coupling means (transceivers) are shown with these control devices, by means of which the subscribers are coupled to the network.
  • These transceivers can advantageously be integrated Circuits be formed.
  • Participants networked in this way can be, for example, several control units in a motor vehicle, which have to exchange data with one another.
  • CAN_H is connected to the masses present in each subscriber via specific termination resistors RTH.
  • CAN_L is connected to the existing VCC voltage (+ 5V) in each participant via specific RTL termination resistors.
  • the voltage on CAN_H and CAN_L represents an average value of the respective masses or VCC voltages of the individual participants. Any deviations from these voltages of individual participants only slightly influence the voltage on the data line. As a result, in the event of a local deviation of the potential due to incorrect ground contact to CAN_H or CAN_L, measurable voltages occur that deviate from the expected values.
  • the local supply voltage of the subscriber USG can be measured by the individual subscriber himself.
  • the individual subscriber measures the supply voltage USG in relation to its own ground connection U GND.
  • the supply voltage USG that can be measured by the individual subscriber is correspondingly lower.
  • This value of the supply voltage USG can be transmitted via the data bus and compared with other determined supply voltages USG.
  • a faulty contact can be inferred from a deviation, the ground contact and / or the UBATT contact being faulty.
  • FIG. 2 shows the voltage relationships of a subscriber who has a mass offset.
  • This ground offset of the participant ie a potential shift between GND SG compared to the vehicle mass
  • Rx control unit
  • Ry body mass
  • the measurement of the mass error is therefore usefully coupled to the control unit-specific application (for example, if the window lift motor is active).
  • the voltage U SG can also be taken into account (for verification).
  • the receivers single-wire reception thresholds can be manipulated, the detected error can be written to a diagnostic memory, which can be read out, for example, during routine maintenance of the vehicle, or communication (transmission) can only be carried out if the control unit is free of a load current (emergency operation). In this case, there is no or only a slight potential shift.
  • Figure 3 shows a first embodiment of a circuit for detecting a ground fault.
  • the voltages URTH and URTL are each fed to an input of a comparator.
  • the other input of this comparator is supplied with a voltage which is derived from the voltage VCC with respect to the ground potential (GND-SG).
  • the measurement is carried out via a trigger module when the bus is in the steady recessive state. This can be deduced if a time has passed after the transition to the recessive state. This time must be selected so that the transient process is over and it must also be ensured that the dominant state has not yet been switched back to.
  • the mass offset measurement can be verified x-fold by downstream flip-flops before ERROR activation occurs.
  • FIG. 4 shows a further exemplary embodiment of a circuit for detecting a ground fault, in which the battery voltage U BATT is also taken into account compared to the circuit according to FIG. 3. Furthermore, the reference potentials are generated by means of a single D / A converter via a multiplexer Mux and fed to the respective inputs of the comparators.
  • FIG. 5 shows an exemplary embodiment of a representation of the time relationships for determining the time of measurement of the mass error.
  • the state of the bus can be seen in the upper part of this illustration.
  • the lower part of the illustration shows when a measurement should take place depending on the bus state (enable).
  • FIG. 6 shows a further exemplary embodiment of a circuit for detecting a ground fault, which is suitable in a particularly simple manner for integration into a system base chip.
  • the quantities to be measured URTH, URTL, U BATT are fed via a multiplexer Mux to a single A / D converter, via which the voltages to be evaluated are fed to a logic module (logic ground shift detection).
  • a signal (enable) which represents the bus status is also fed to this module, so that the measurement and evaluation take place at the correct time.
  • Diagram 7a shows the voltage U CAN_H when changing from the recessive to the dominant state and when changing from the dominant state to the recessive state.
  • the time profile of the voltage U CAN_H is such that when TX changes (see FIG. 7b) from “1" to "0” and vice versa, the signal shows an over-riding behavior.
  • the voltage U CAN_H becomes smaller than the voltage U GND.
  • the voltage U CAN_H changes only after a certain time delay after a change in TX. This time delay is of the order of approximately 500ns.
  • the measurement and the comparison of the voltages takes place at time t1.
  • This point in time lies within a time window after the change from TX from "1" to "0".
  • the voltage on the CAN_H line has not yet changed. It also ensures that this Time (immediately before the transition to the dominant state) the recessive state has settled.
  • FIG. 7d shows the logical variable, which may represent a ground fault. This variable is updated at time t1. Since there was no fault at this point in time, no fault is recognized.
  • the sum of these voltages can be up to 1.4 volts. Since the components are not precisely defined with regard to their quality and tolerances, this can lead to deviations in the voltages. These deviations in the voltages would also be included in a measurement in the dominant bus state. When measuring in the recessive bus state, however, the transistor blocks, so that the components no longer play a role with regard to their tolerances.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Test And Diagnosis Of Digital Computers (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Claims (18)

  1. Procédé de contrôle du contact de masse d'abonnés/participants (SG1, SG2, ..., SGn), d'un système en réseau, des données étant envoyées et reçues par l'intermédiaire d'au moins une ligne (CAN_H, CAN_L), au moins une ligne (CAN_H), existant à chaque abonné (SG1, SG2, ..., SGn), étant reliée, par l'intermédiaire d'un agencement résistif (RTH) ainsi que par une mise en contact, à un potentiel commun (GND) des abonnés (SG1, SG2, ..., SGn), et est susceptible d'être reliée à un autre potentiel (VCC), par l'intermédiaire d'un interrupteur pouvant être commandé (transceiver), la tension (URTH) étant comparée à un potentiel prédéterminé, par l'intermédiaire de l'agencement résistif (RTH), lorsque la ligne (CAN_H) présente un potentiel dans un état transitoire, des conclusions étant tirées, concernant l'état du contact de. masse de l'abonné (SG1, SG2, ..., SGn), à partir d'une comparaison entre la tension (URTH), sur l'agencement résistif (RTH), et le potentiel prédéterminé.
  2. Procédé de contrôle du contact de masse d'abonnés/participants (SG1, SG2, ..., SGn), d'un système en réseau, des données étant envoyées et reçues par l'intermédiaire d'au moins une ligne (CAN_H, CAN_L), au moins une ligne (CAN_L), existant à chaque abonné (SG1, SG2, ..., SGn), étant reliée, par l'intermédiaire d'un agencement résistif (RTL), à un potentiel (VCC), spécifique à l'abonné, des abonnés (SG1, SG2, ..., SGn) et est susceptible d'être reliée à un potentiel commun (GND), par l'intermédiaire d'un interrupteur pouvant être commandé (transceiver) ainsi qu'une mise en contact, la tension (URTL) à l'agencement résistif (RTL) étant comparée à un potentiel prédéterminé, lorsque la ligne (CAN_L) présente un potentiel en un état transitoire, des conclusions étant tirées, concernant l'état du contact de masse de l'abonné (SG1, SG2, ..., SGn), à partir d'une comparaison entre la tension (URTL) à l'agencement résistif (RTL) et le potentiel prédéterminé.
  3. Procédé selon la revendication 1, caractérisé en ce que le potentiel à l'état transitoire est le potentiel commun (GND).
  4. Procédé selon la revendication 2, caractérisé en ce que le potentiel à l'état transitoire correspond au potentiel (VCC) spécifique à l'abonné.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la comparaison s'effectue avec un certain retard temporel, après que, au moyen de l'interrupteur pouvant être commandé (transceiver-CAN), la ligne (CAN_H, CAN_L) ait été branchée à un potentiel déterminé.
  6. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la comparaison est effectuée dans les limites d'une fenêtre de temps, après que l'état de commutation de l'interrupteur pouvant être commandé (transceiver), ait été changé.
  7. Procédé de contrôle du contact de masse d'abonnés/participants (SG1, SG2, ..., SGn) d'un système en réseau,
    caractérisé en ce que la tension de batterie (USG), pouvant être constatée par les différents abonnés (SG1, SG2, ..., SGn), est comparée à la tension de batterie (USG) pouvant être constatée par un ou plusieurs abonnés de référence (SG1, SG2, ..., SGn), sachant que, dans le cas où l'écart entre les tensions de batterie (USG) constatées est supérieur à une valeur-seuil déterminée, on conclue à un défaut du contact de masse.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que la tension de batterie (USG) pouvant être constatée par les différents abonnés (SG1, SG2, ..., SGn) est comparé à la tension de batterie (USG) pouvant être constatée par le un ou plusieurs abonnés de référence (SG1, SG2, ..., SGn), sachant que, dans le cas où l'écart entre les tensions de batterie (USG) constaté est supérieur à une valeur-seuil déterminée, on conclue à un défaut du contact de masse.
  9. Procédé selon la revendication 7 ou 8, caractérisé en ce que les processus de mise en contact de l'abonné de référence (SG1, SG2, ..., SGn), sont effectués à deux reprises.
  10. Procédé selon l'une des revendications 7 à 9, caractérisé en ce que, dans un véhicule, la comparaison de la tension de batterie ne s'effectue qu'au-dessus d'une valeur de vitesse de rotation déterminée.
  11. Procédé selon l'une des revendications 1 à 10, caractérisé en ce que la comparaison est activée lorsqu'un courant de charge minimale ISG, déterminé, passe dans l'abonné (SG1, SG2, ..., SGn) correspondant.
  12. Procédé selon l'une des revendications 1 à 11, caractérisé en ce que, dans le cas d'un écart identifié est supérieur à la valeur-seuil concernant l'abonné (SG1, SG2, ..., SGn) respectif, un enregistrement est effectué dans une mémoire de diagnostique.
  13. Procédé selon l'une des revendications 1 à 12, caractérisé en ce que, en cas d'écart identifié supérieur à la valeur-seuil concernant l'abonné (SG1, SG2, ..., SGn) respectif, les seuils de réception en mode monofilaire sont décalés de manière correspondante.
  14. Procédé selon l'une des revendications 1 à 13, caractérisé en ce que, en cas d'écart identifié, supérieur à la valeur seuil, de l'abonné (SG1, SG2, ..., SGn) respectif, ne sont envoyées que des données lorsque l'appareil de commande (SG1, SG2, ..., SGn) est privé de courant de charge.
  15. Procédé selon l'une des revendications 1 à 14, caractérisé en ce qu'une interrogation de défaut en décalage de masse est effectuée à plusieurs reprises, avant de procéder à un affichage de défaut (ERROR).
  16. Dispositif de contrôle du contact de masse d'abonnés/participants (SG1, SG2, ..., SGn) d'un système mis en réseau, la mise en réseau étant réalisée en ce que, par l'intermédiaire de deux lignes (CAN_H, CAN_L), des données sont envoyées et reçues, une ligne (CAN_H), existant à chaque abonné (SG1, SG2, ..., SGn) étant reliée à un potentiel commun (GND) des abonnés (SG1, SG2, ..., SGn), par l'intermédiaire d'un agencement résistif (RTH) et d'une mise en contact, et'est susceptible d'être reliée à une autre potentiel (VCC), par l'intermédiaire d'un interrupteur pouvant être commandé (transceiver), l'autre ligne (CAN_L), existant à chaque abonné (SG1, SG2, ..., SGn), étant reliée à un potentiel (VCC), spécifique à l'abonné, des abonnés (SG1, SG2, ..., SGn), par l'intermédiaire d'un l'agencement résistif (RTL) et est susceptible d'être reliée à un potentiel GND, par l'intermédiaire d'un interrupteur pouvant être commandé (transceiver) ainsi que d'un processus de contact, et la tension, chutant du fait du au moins un agencement résistif (RTH, RTL), étant amenée chaque fois à l'entrée d'un comparateur, à l'autre entrée duquel est amené un potentiel de comparaison, des conclusions sur l'état du processus de contact de masse de l'abonné (SG1, SG2, ..., SGn) étant tirées à partir du signal de sortie du comparateur.
  17. Dispositif selon la revendication 16, caractérisé en ce que les différents potentiels (potentiels de référence), qui sont amenés aux entrées des comparateurs, sont générés par l'intermédiaire d'un multiplexeur (Mux), à partir d'une tension et sont amenés aux entrées respectives des comparateurs.
  18. Dispositif selon la revendication 16 ou 17, caractérisé en ce que les tensions (URTH, URTL, U Batt) à mesurer, sont amenées à une unité d'évaluation, par l'intermédiaire d'un multiplexeur (Mux).
EP97916391A 1996-03-26 1997-03-26 Procede pour le controle des connexions de masse de pieces d'un systeme formant un reseau Expired - Lifetime EP0890110B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19611944A DE19611944C2 (de) 1996-03-26 1996-03-26 Integrierter Schaltkreis zur Kopplung eines mikrokontrollierten Steuergerätes an einen Zweidraht-Bus
DE19611944 1996-03-26
WOPCT/EP96/05088 1996-11-19
PCT/EP1996/005088 WO1997036399A1 (fr) 1996-03-26 1996-11-19 Procede pour determiner des decalages de potentiel entre modules electroniques d'un reseau a bus filaire
PCT/EP1997/001534 WO1997036184A1 (fr) 1996-03-26 1997-03-26 Procede pour le controle des connexions de masse de pieces d'un systeme formant un reseau

Publications (2)

Publication Number Publication Date
EP0890110A1 EP0890110A1 (fr) 1999-01-13
EP0890110B1 true EP0890110B1 (fr) 2001-09-19

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Family Applications (2)

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EP97916390A Expired - Lifetime EP0890109B1 (fr) 1996-03-26 1997-03-26 Procede permettant de verifier et d'assurer la disponibilite d'un systeme en reseau
EP97916391A Expired - Lifetime EP0890110B1 (fr) 1996-03-26 1997-03-26 Procede pour le controle des connexions de masse de pieces d'un systeme formant un reseau

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EP97916390A Expired - Lifetime EP0890109B1 (fr) 1996-03-26 1997-03-26 Procede permettant de verifier et d'assurer la disponibilite d'un systeme en reseau

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EP (2) EP0890109B1 (fr)
JP (2) JP3263813B2 (fr)
AT (2) ATE200932T1 (fr)
DE (2) DE59703473D1 (fr)
WO (2) WO1997036184A1 (fr)

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DE19754640A1 (de) * 1997-12-09 1999-06-10 Bosch Gmbh Robert Verfahren zur Koordination von Netzwerkkomponenten
US7257740B2 (en) * 2002-06-10 2007-08-14 Nxp B.V. Circuit for detecting ground offset of parts of a network
US7330695B2 (en) * 2003-12-12 2008-02-12 Rosemount, Inc. Bus powered wireless transmitter
KR101590167B1 (ko) * 2010-06-03 2016-01-29 현대모비스 주식회사 Ａｂｓ 시스템의 모터 구동부의 오동작 방지 회로
DE102013202064A1 (de) 2013-02-08 2014-08-14 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Vorrichtung zum Verbinden eines Diagnosegeräts mit einem Steuergerät in einem Kraftfahrzeug
CN110504706B (zh) * 2019-07-22 2021-05-04 中国农业大学 虚拟同步发电机并网的暂态稳定性预测方法及装置
CN111240287B (zh) * 2020-01-20 2020-09-22 青岛成通源电子有限公司 汽车线束生产管理系统
DE102021213472A1 (de) 2021-11-30 2023-06-01 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zur Ausführung einer Fahraufgabe in einem dezentralen Steuereinheitensystem und dezentrales Steuereinheitensystem

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DE3713825A1 (de) * 1987-04-24 1988-11-10 Siemens Ag Hochverfuegbares serielles bussystem
DE3826774A1 (de) * 1988-08-06 1990-02-08 Bosch Gmbh Robert Netzwerkschnittstelle
US4908822A (en) * 1988-12-07 1990-03-13 Chrysler Motors Corporation Electrical devices command system, single wire bus and smart dual controller arrangement therefor
CA2025173C (fr) * 1990-09-12 1995-08-22 Kazuya Akashi Appareil de diagnostic pour un systeme de transmission de donnees et methode de diagnostic connexe
DE4212742A1 (de) * 1992-04-16 1993-10-21 Bayerische Motoren Werke Ag Verfahren zur Fehlererkennung bei einem Datenbus
DE4306361A1 (de) * 1993-03-02 1994-09-08 Daimler Benz Ag Datenkommunikationssystem

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Publication number Publication date
JP3294852B2 (ja) 2002-06-24
JP2000501268A (ja) 2000-02-02
DE59704664D1 (de) 2001-10-25
WO1997036183A1 (fr) 1997-10-02
ATE205940T1 (de) 2001-10-15
EP0890109A1 (fr) 1999-01-13
EP0890109B1 (fr) 2001-05-02
JP2000505262A (ja) 2000-04-25
EP0890110A1 (fr) 1999-01-13
DE59703473D1 (de) 2001-06-07
ATE200932T1 (de) 2001-05-15
WO1997036184A1 (fr) 1997-10-02
JP3263813B2 (ja) 2002-03-11

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